激光加工应用技术基础知识（Basic knowledge of laser processing application technology）.docVIP

激光加工应用技术基础知识（Basic knowledge of laser processing application technology） Knowledge of laser cutting applications First, the main characteristics of laser cutting 1 、 laser cutting narrow slit, workpiece deformation is small The laser beam focuses on very small light spots so that the focus reaches a very high power density. At this point, the beam enters much more heat than is reflected or transmitted or diffused by the material, and the material is quickly heated to the degree of vaporization and evaporated to form a hole. As the beam moves linearly with the material, the aperture continues to form a slit with a very narrow width. The cutting edge has little effect on heating, and there is no deformation of the workpiece. The auxiliary steam body suitable for the cutting material is also added during the cutting process. Steel cutting using oxygen as the auxiliary gas and molten metal by oxidation exothermic chemical reaction materials, at the same time help blow seams in slag. Cut polypropylene, a kind of plastic, using compressed air, cotton, paper and other flammable materials cutting, using inert gas. The auxiliary steam entering the nozzle can also cool the focusing lens to prevent smoke and dust from entering the lens seat, polluting the lens and leading to overheating of the lens. Most organic and inorganic materials can be cut by laser. In the industrial manufacturing system, which occupies a heavy metal processing industry, many metal materials, no matter what kind of hardness they are, can carry out deformation free cutting. Of course, for high reflectivity materials such as gold, silver, copper and aluminum alloys, they are also good heat transfer conductors, so laser cutting is difficult and can not even be cut. Laser cutting burrs, wrinkle, high precision, better than plasma cutting. Many of the mechanical manufacturing industry, due to the modern laser microcomputer program control cutting system can facilitate the cutting of various shapes and sizes,